Niagara and MetaHuman

When I attempt to add the Niagara effect to the metahuman it seems to only apply to the arms and legs. The body is broken up into three parts. Is there not a way to combine it all so that the Niagara system applies to the entire mesh? I thought that maybe that Id needed to apply the NS to the individual parts, but it seems to be a no go. Help, por favor. Yes thats how I said it.